An annoying bastard from Minecraft. Normally silent, once you get close enough he'll hiss before exploding taking all the nearby area with him. And he doesn't burn in the daytime, meaning you'll always have to be on constant guard or he'll sneak into your house and pop out when you come back.

Creeper: That's a very nice EVERYTHING you've got there. It would be a shame if something were to happen to it...

A tool used by mechanics to "creep" beneath a vehicle in order to better work under it in a more comfortable position. It looks like a small platform with a cushion on top that has a wheel on each corner and sometimes low rails on the sides so you can carry it around.

John wanted to work on his car's axle, so he laid down on a creeper to keep off the floor.